Photographic camera

ABSTRACT

A camera having, in addition to a real focal length photographing mode, a pseudo focal length photographing mode, namely, a photographing mode in which a part of a photographed image frame of a film is printed at an enlarging ratio different from an ordinary enlarging ratio to obtain a print as if it had been photographed using a telephoto lens. It is provided with means for recording photographing mode information on a frame of a film when the pseudo focal length photographing mode is selected, and a control means which brings a flash light emitting device into an operable condition in response to the selection of the pseudo focal length photographing mode and which actuates the flash light emitting device in synchronism with release of the shutter. An optical axis of a photographing lens and a flash emission tube are spaced from each other, and the pseudo focal length photographing mode can be selected only when a negative film is loaded in the camera.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a camera having a real focal lengthphotographing mode (normal mode) for printing a normal photographingrange on a photographic paper and a pseudo focal length photographingmode (trimming mode) for printing in a narrower range of field andeffecting a film printing at an enlarging ratio different from a normalenlarging ratio in printing to obtain a print as if it had beenphotographed by a telephoto lens.

2. Description of the Prior Art

In photographing, it is important to decide a composition to bereproduced on a photographic paper. To this end, there are known amethod in which the distance up to an object to be photographed ischanged or photographing is performed using an interchangeable lens or azoom lens, and a method in which a film is checked after photographingand a decision of composition to be reproduced is made by trimming.

As a camera based on the method utilizing trimming there has beenproposed a camera in U.S. Pat. No. 3,490,844 and Japanese PatentApplication Laid-open Publication No. 54-26721 (26721/79) in which afinder optical system capable of changing the size of field indicatedtherein is provided in the camera to thereby select an image frame rangeto be photographed, and a trimming information is recorded on a film ininterlock with the finder optical system, while in printing, a part ofthe photographed image frame is printed at an enlarging ratio differentfrom a normal enlarging ratio on the basis of the trimming information,whereby there can be obtained a print as if it had been photographed bya telephoto lens having a focal length larger than that of the lensoriginally attached to the camera.

When a photograph taken from an object in such pseudo focal lengthphotographing mode is compared with a photograph taken from the sameobject but using a lens having a focal length equal to that which hasbeen set in a pseudo manner by the pseudo focal length photographingmode, it is seen that the depth of field is larger in the former by thetrimming proportion than in the latter.

If the distance up to an object is U (provided U>>f) and F-number of alens is F, and the diameter of an allowable circle of confusion is δ,then a depth of field a₁ of a lens having a focal length f=f₁ isrepresented as follows: ##EQU1## Likewise, a depth of field a₂ of a lenshaving a focal length f=f₂ is represented as follows: ##EQU2##

On the other hand, in the where a photograph taken by the lens of focallength f=f₁ is subjected to trimming so that it corresponds to aphotograph taken by the lens of focal length f=f₂, the diameter of aconfusion circle corresponding to f=f₂ must be δ, so the diameter of aconfusion circle at f=f₁ becomes δ×f₁ /f₂. A depth of field a₃ at thistime is represented as follows: ##EQU3##

Therefore, if a comparison is made between the depth of field a₃obtained after trimming of the photograph taken by the lens of focallength f=f₁ and the depth of field a₂ of the photograph taken by thelens of focal length f=f₂, there is obtained the following result:##EQU4## Thus, the depth of field is larger f₂ /f₁ times in the adoptionof trimming and this magnification corresponds to the proportion oftrimming, so the depth of field becomes larger by an amountcorresponding to the proportion of trimming.

As a result, in the case of a print obtained from photographing in apseudo focal length photographing mode, the probability of both a mainobject and surrounding objects entering the depth of field increases andthe resulting photograph is in focus to both the main object and thesurrounding objects, making it difficult to make a clear distinction ofthe two. Consequently, the photograph is confused and unsightly.

Further, when a color photograph of a person is taken using a flashlight emitting device in a dark place, the person's eye is sometimesphotographed as a red eye, and this phenomenon is called a red-eyephenomenon. Although this phenomenon has not been made clear completely,it is said that the light emitted from the flash light emitting deviceis reflected by the choroid located behind the retina in the interior ofthe human's eyeball and this reflected light causes the pupil to bephotographed red.

This red-eye phenomenon is apt to occur when the distance between thephotographing lens of the camera and the flash light emitting device isshort or as the photographing distance between the photographing lens ofthe camera and the eye of person to be photographed.

As a solution to this problem there has been proposed a cameraconstructed so that the sufficient distance between the flash lightemitting device and an optical axis of the photographing lens can bemaintained constant (see Japanese Patent Publication No. 58-20021(20021/83)).

In the photographing with a camera having a pseudo focal lengthphotographing mode, a part of a photographed image frame is enlarged andeven a remote object is printed large as if it had been photographedusing a telephoto lens, so that there inevitably is a tendency tophotographing a remote object as compared with the real focal lengthphotographing mode, and the red-eye phenomenon is apt to occur aspreviously explained.

In the case of a photograph which has been taken in the real focallength photographing mode, even in the event the red-eye phenomenonshould occur, it will not be so conspicuous because the enlarging ratioin printing is low. On the other hand, in the case of a photograph whichhas been taken in the pseudo focal length photographing mode, if thered-eye phenomenon should occur, it will be conspicuous because theenlarging ratio in printing is high.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a camera capable ofeffecting a flash photographing forcibly upon selection of a pseudofocal length photographing mode and affording a photograph having astereoscopic feeling.

It is another object of the present invention to provide a cameracapable of preventing the red-eye phenomenon which is apt to occur inflash photographing upon selection of a pseudo focal lengthphotographing mode.

It is a further object of the present invention to provide a camerawhich permits the selection of a pseudo focal length photographing modewhen a negative film is loaded into the camera.

The above and other objects and features of the invention will appearmore fully hereinafter from a consideration of the following descriptiontaken in connection with the accompanying drawing wherein one example isillustrated by way of example.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 6 illustrate a first embodiment of the present invention, ofwhich:

FIG. 1 is a perspective view of a camera;

FIG. 2 is a fron view thereof;

FIG. 3 is a camera system circuit diagram;

FIGS. 4A and 4B are flowcharts of an interruption handling routine onphotographing;

FIG. 5 is a flowchart of a stop routine; and

FIG. 6 is a flowchart of an interruption handling routine based onphotographing mode selection.

FIGS. 7 to 14 illustrate a second embodiment of the present invention;of which:

FIG. 7 is a perspective view of a camera;

FIGS. 8, 9 and 10 are front views showing changes in external appearanceof the camera with change-over of photographing mode, FIG. 8illustrating the state of a real focal length photographing mode, FIG. 9illustrating the state of a flash emitting mode and FIG. 10 illustratingthe state of a pseudo focal length photographing mode;

FIG. 11 is a camera system circuit diagram; FIGS. 12A and 12B areflowcharts of an interruption handling routine on photographing;

FIG. 13 is a flowchart of a stop routine; and

FIG. 14 is a flowchart of an interruption handling routine based onphotographing mode selection.

FIGS. 15 to 24 illustrate a third embodiment of the present invention,of which:

FIG. 15 is a perspective view of a camera;

FIGS. 16 and 17 are front views of a liquid crystal display panel, FIG.16 illustrating the panel with a negative film loaded in the camera andFIG. 17 illustrating the panel with a positive film loaded in thecamera;

FIG. 18 is a camera system circuit diagram;

FIGS. 19A, 19B and 19C are flowcharts of an interruption handlingroutine on photographing;

FIG. 20 is a flowchart of a rewind routine;

FIG. 21 is a flowchart of a stop routine;

FIGS. 22A and 22B are flowchars of an interruption handling routinebased on photographing mode selection;

FIG. 23 is a flowchart of a photographing mode selecting routine; and

FIG. 24 is a flowchart of a back lid opening routine.

DESCRIPTION OF PREFERRED EMBODIMENTS

Embodiments of the present invention will be described hereinunder withreference to the accompanying drawings.

First Embodiment

The first embodiment is an example of a camera having two kinds ofphotographing modes which are a real focal length photographing mode(normal mode) and a pseudo focal length photographing mode (trimmingmode).

FIG. 1 is a perspective view showing an external appearance of the firstembodiment, in which the numeral 1 denotes a camera body; numeral 2denotes a photographing lens, and numeral 3 denotes a flash lightemitting device, broken lines indicating a photographing position in apseudo focal length photographing mode. Further, numerals 4, 5, 6 and 7denote a photographing mode change-over button, a light detecting windowof an automatic exposure control device, a finder window, and a finderilluminating window, respectively. Numerals 8 and 9 each represent arange finder window of an automatic focusing device. And numerals 10, 11and 12 denote a film counter, a shutter release button, and a flashforcing button, respectively.

FIG. 2 is a front view of the first embodiment, showing a position of alift lever 13 interlocked with the photographing mode change-over button4 and that of a retaining portion 13a thereof. Numeral 14 denotes aguide pin for the lift lever 13. Numeral 3a denotes a light emittingtube in a flash light emitting device 3. The distance between the centerof an optical axis of the photographing lens 2 and the light emittingtube 3a is indicated by l.

In this embodiment there are provided two kinds of photographing modeswhich are a real focal length photographing mode A and a pseudo focallength photographing mode Tr, and the photographing mode change-overbutton 4 is constructed so that it slides between the two positions of Aand Tr to effect the change-over of mode, as shown in FIGS. 1 and 2.

FIG. 2 shows a construction of a photographing mode change-over portion.An explanation will now be made about a mechanism for moving the flashlight emitting device upon change-over from one to another photographingmode. The lift lever 13 is urged upward by means of a spring (not shown)in a position adjacent to the photographing mode change-over button 4,and the flash light emitting device 3 is mounted on top of the liftlever 13. The photographing mode change-over button 4 is normally urgedto the real focal length photographing mode A side by means of a spring(not shown).

When the photographing mode change-over button 4 is in the position ofthe real focal length photographing mode A, the retaining portion 13a ofthe lift lever 13 and the change-over button 4 are in engagement witheach other and the flash light emitting device 3 is in its lowerposition indicated by solid line in FIG. 2.

When the photographing mode change-over button 4 is changed over to theposition of the pseudo focal length photographing mode Tr, the retainingportion 13a of the lift lever 13 and the change-over button 4 aredisengaged from each other, so the lift lever 13 rises and the flashlight emitting device 3 mounted on top thereof reaches its raisedposition indicated by broken line in FIG. 2.

As a result, the distance l between the optical axis of thephotographing lens and the center of the light emitting tube 3a in theflash light emitting device 3 becomes larger than that in the real focallength photographing mode.

When the flash light emitting device 3 is pushed downward, it goes downto its lower position in the real focal length photographing modereversely to the above, and the photographing mode change-over button 4also returns to the position of the real focal length photographing modeA, so that the retaining portion 13a of the lift lever 13 and thephotographing mode change-over button 4 again come into engagement witheach other.

In the real focal length photographing mode, the photographing modechange-over button 4 is in the position A and the flash light emittingdevice 3 stays in its solid line position. In this state, in which anobject to be photographed is bright, there is made an exposure controlby an automatic exposure control device. At this time, if the emissionof flash light is required due to rear light or for another reason, itcan be done by pushing the flash forcing button 12.

In the pseudo focal length photographing mode, the photographing modechange-over button 4 is shifted to the position Tr and the flash lightemitting device 3 goes up to its broken line position in FIG. 2,permitting the emission of flash light.

The photographing mode change-over button 4 is provided with a slideswitch adapted to move in interlock with the change-over button, wherebya signal indicative of a photographing mode is provided to alater-described microprocessor.

A camera system will now be explained. FIG. 3 is a circuit diagram ofthe camera system. Electric power supplied from a power battery BA isfed to a microprocessor MPU, a film winding control section FW, a flashlight emitting section FL, pulse generators PG₀ and PG₁, an AND circuitAN, a frame display TRD, a film sensitivity setting section FS, a chargecompletion display element CHD, a release lock warning indicator RLW,and a release circuit REL. Further, from a power transistor BT which isoperated by a signal provided from an output port P_(wc) of themicroprocessor MPU, electric power is supplied to an automatic exposurecontrol device AE, an automatic focusing device AF, a trimming markprinting portion TRM, a D-A converter DA, a flashmatic timer FMT, etc.

Explanation will now be made about switches which are turned ON by theoperation of operating switches of the camera. SW₁ denotes a lightmeasuring switch, which is closed by depresing the shutter button 11 upto a first stage. SW₂ denotes a release switch, which is closed bydepressing the shutter button 11 up to a second stage. TRS denotes atrimming switch, which closes when the photographing mode change-overbutton 4 is turned to the pseudo focal length photographing mode Tr, andwhich opens when the button 4 is turned to the real focal lengthphotographing mode A. FLS denotes a flash switch, which closes upondepression of the flash forcing button 12. EXS denotes a switch which isnot externally operated but turns ON upon completion of exposure controloperation and OFF upon completion of charging of the automatic exposurecontrol device AE. These switches are connected to an interruptionterminal INT₀ and input ports P₀, P₁, P₂, P₃, respectively, of the MPU.The switches TRS and FLS are connected to an interruption terminal INT₁of the MPU through pulse generators PG₀, PG₁ and AND gate AN for causingan interrupt to the MPU to re-se information which has been provided tothe MPU, upon turning from ON to OFF or OFF to ON.

Where the photographing mode is changed from the real focal lengthphotographing mode to the pseudo focal length photographing mode, orfrom the pseudo focal length photographing mode to the real focal lengthphotographing mode, or when the forced emission of flash light is to bedone or stopped, a pulse signal is provided to the MPU to cause aninterrupt thereto and rewrite the flag stored therein.

The film winding control section FW drives a film winding motor MO inaccordance with a winding command signal WSTA provided from an outputport P₄ of the MPU. Upon winding up of the film by a predeterminedlength, e.g. one frame, the film winding control section FW stopswinding of the film and provides a film winding end signal WEND to aninput port P₅ of the MPU.

The flash light emitting section FL is boosted upon receipt of a chargestart command signal CHSTA from an output port P₆ of the MPU, to startcharging of a main capacitor. To check the state of charging of the maincapacitor, a detector actuating signal DET is provided form an outputport P₇ of the MPU. Upon completion of charging of the main capacitor inthe flash light emitting device, a charge completion signal CHC isprovided from the flash light emitting section FL to an input port P₈ ofthe MPU. The flash light emitting section FL actuates a xenon tubeprovided in the interior thereof upon receipt of a light emissioncommand signal FLSTA from a later-described flashmatic timer FMT.Moreover, a charge completion signal is provided from an output port P₉of the MPU upon completion of charging of the main capacitor in theflash light emitting section FL to light the charge completion displayelement CHD. In the flash emitting mode, in order to prevent from theshutter release operation before completion of charging of the maincapacitor in the flash light emitting device, the shutter releaseoperation is locked before the completion of charging in the MPU and atthe same time a release lock warning signal is provided from a outputport P₁₀ of the MPU to light the release lock warning display RLW.

When the power transistor BT is turned ON, the automatic exposurecontrol device AE operates to make the measurement of brightness ofobject to be photographed. Upon issuance of an AE lock signal AEL froman output port P₁₃ of the MPU, an exposure value E_(v) obtained from thelight measure value at that moment and the film sensitivity are locked.This is termed AE lock.

As to the above film sensitivity information, the film sensitivitysetting section FS is set by automatic reading of DX code on the filmpatrone or by manual operation, and an output signal therefrom is fed tothe automatic exposure control device AE as an analog signal through theD/A converter DA, and it is also fed to the flashmatic timer FMT as willbe described later.

In the automatic exposure control device AE, when it is judged as aresult of exposure calculation that the field is dark and the shutterspeed exceeds a lower speed limit, a lower speed limit signal SS isprovided to an input port P₁₄ of the MPU.

When the power transistor BT turns ON, the automatic focusing device AFalso starts operating to measure the distance up to an object and storedata on distance, and it provides the distance data DISD to theflashmatic timer FMT. Upon issuance of a release signal from an outputport P₁₁ of the MPU, the release circuit REL operates to disengage thelens, so that the lens starts moving, while the amount of its movementis measured in terms of pulses until coincidence with the prestoreddistance data, whereupon a driving magnet AFM is deenergized to stop themovement of the lens.

Turning again to the automatic exposure control device AE, when therelease signal from the output port P₁₁ is provided and the operation ofthe automatic exposure control device AE is completed, the shutterbegins to open through a mechanical interlock and a count switch CSturns ON. The shutter is a triangular wave-shaped shutter which alsoserves as a disphragm. Pulses are provided from an encoder which isinterlocked with the movement of the shutter, and these pulses arecounted. When the counted pulse value coincides with the previouslyAE-locked exposure value E_(v), it is judged that the exposure isappropriate, and a driving magnet AEM is deenergized to close theshutter.

In the case of a dark object, the shutter speed becomes lower, but whenan exposure value E_(v) obtained by light measurement of the objectbecomes below a value E_(vc) determined in accordance with thecombination of the lower limit speed of the shutter and an aperturevalue, there is made a limitation of speed to prevent a further decreaseof the shutter speed. More specifically, in the automatic exposurecontrol device AE, when the count switch CS turns ON, an internal timerstarts operating, and after the lapse of a predetermined time, theshutter driving magnet AEM is deenergized forcibly. And after apredetermined time at which a closing motion of the shutter startsactually, a shutter closing signal AEC is provided to the flashmatictimer FMT, which in turn provides a flash emission start signal FLSTA tothe flash light emitting section FL to emit flash light.

The flashmatic timer FMT starts operation in accordance with a signalFLE provided from an output port P₁₆ of the MPU. The flashmatic timerFMT calculates a flash light emission start timing data for the flashlight emitting section FL on the basis of the distance data DISDprovided from the automatic focusing device AF and the film sensitivitydata provided from the film sensitivity setting section FS. When thecounting start time which counting is started by the action of the countswitch CS adapted to close upon start of opening of the shutter, hascome to satisfy the above flash light emission start timing data, theflashmatic timer FMT provides a flash emission start signal FLSTA to theflash light emitting section FL, whereby flash light is emitted when theshutter blade has opened up to a position suitable for affording arequired exposure. Thus, an appropriate exposure can be afforded. On theother hand, in the case where the shutter closing signal AEC is providedbefore the foregoing time satisfies the flash emission start timingdata, that is, if the shutter is forced to start closing due to theshutter low speed limitation as previously explained in connection withthe automatic exposure control device AE, there is provided the shutterclosing signal AEC. In this case, however, upon receipt of the signalAEC, the flashmatic timer FMT provides a flash emission start signalFLSTA to the flash light emitting section FL to emit flash light.

When the pseudo focal length photographing mode is selected, a pseudofocal length photographing mode signal is provided from an output portP₁₅ of the MPU and a frame display TRD indicative of a printing area ismade in the finder. For example, liquid crystal device may be used forthis display.

Further, a trimming mark is printed on the film at the time of exposurecontrol and this is done by a printing circuit TRM. This circuit TRMstarts a printing operation upon receipt of "L" pulse from an outputport P₁₂ of the MPU and performs the same operation for a period of timecorresponding to the film sensitivity data provided from the D-Aconverter DA.

The following description is now provided about signal processings inphotographing-related portions performed within the MPU.

FIG. 4 shows an interrupt processing caused by closing of the lightmeasuring switch SW₁ upon depression of the shutter release button 11 upto the first stage. Upon arrival of an interruption signal at theterminal INT₀, the boosting operation for charging the main capacitor inthe flash light emitting section FL and the operation for detecting acharged state of the main capacitor are stopped (step S1). This isbecause if the exposure control device AE is operated by an interruptprocessing during boosting, there is fear that the exposure controlwould not be effected correctly because the supply voltage is in adropped state.

Next, the power transistor BT is turned ON (step S2) to supply electricpower to the automatic exposure control device AE, the automaticfocusing device AF and so on. After waiting for a predetermined time dueto the operation of AE and AF, a measured value is memorized and the AElock is effected (steps S3 and S4).

Judgment is made (step S5) as to whether the calculated exposure valueE_(v) is smaller than the lower speed limit exposure value E_(vc) whichis determined from a predetermined combination of shutter speed andaperture value. If the answer is affirmative, that is, when the field isdark, "1" is set to a flash flag FLF (step S6). The charge detector inthe flash light emitting section FL is turned ON to check whethercharging is completed or not (steps S7 and S8). If the answer isnegative, program passes to step S26 to bring about a release lock stateand light the release lock warning indicator RLW. Then, upon turning OFFof the light measuring switch SW₁ (step S27), program shifts to a stoproutine as will be described later.

When the charging of the main capacitor of the flash light emittingsection FL is completed, the charge detector is turned OFF and thecharge completion display element CHD is lit, then a check is made as towhether the release switch SW₂ is ON or not (steps S9, S10 and S11).

After the AE lock, when a low speed limit is judged in step S5 and thecalculated exposure value E_(v) is larger than the low speed limitexposure value E_(vc), program passes to step S23, in which judgment ismade as to whether the trimming switch TRS is ON or not. If the answeris affirmative, that is, if the camera is in the pseudo focal lengthphotographing mode, the emission of flash light is to be made, so theprogram passes to step S6 and "1" is set to the flash flag FLF. On theother hand, if the camera is not in the pseudo photographing mode,judgment is made as to whether the flash emission forcing switch FLS isON or not (step S24), and if the answer is affirmative, program passesto step S6, in which "1" is set to the flash flag FLF. If the switch FLSis not ON, "0" is set to the flash flag FLF (step S25) and programpasses to step S11 to check whether the release switch SW₂ is ON or not.

If the answer is negative in step S11, judgment is made as to whetherthe light measuring switch SW₁ is ON or not, and if it is ON, a check ismade again on SW₂, waiting for its turning ON. On the other hand, whenthe light measuring switch SW₁ is not ON, either, program passes to thestop routine (step S28).

If the release switch SW₂ is ON at step S11, a release signal isprovided in step S12 to start the exposure controlling operation.

Then, judgment is made as to whether the trimming switch TRS is ON ornot and if the answer is affirmative, "L" pulse for printing a trimmingmark on the film is output to P₁₂, while this processing is omitted ifthe answer is negative (steps S13 and S14).

Then, judgment is made as to whether the flash flag FLF is "1" or not,and if the answer is affirmative, a flashmatic timer operation commandsignal FLE to be provided to the flashmatic timer FMT is made "L" toactuate the FMT, thereby permitting the emission of flash light. On theother hand, when the flag FLF is not "1"the above operation commandsignal FLE is made "H" so as not to actuate the flashmatic timer FMT(steps S15, S16 and S17).

Upon completion of the exposure operation, the winding of one frame ofthe film is started and performed until completion of the winding,whereupon the winding is stopped, and upon turning OFF of the lightmeasuring switch SW₁, program passes to the stop routine (stepsS18-S22).

FIG. 5 shows the stop routine. First, the flash charging completiondisplay element CHD and the release lock warning display RLW are turnedOFF, and further the charge detector, AE lock and power transistor BTare turned OFF, giving rise to a state which permits interruption (stepsS31-S36). Then, judgment is made as to whether the flash flag FLF is "1"or not (step S37). If the answer is affirmative, then for the nextphotographing, the charge of the main capacitor in the flash lightemitting section FL is performed, and the state of charging is checked.Upon completion of the charging, the detector and the booster are turnedOFF to terminate the processing (steps S38-S42). When the flash flag FLFis not "1", program shifts to step S42 immediately to turn OFF thebooster and terminate the processing.

Reference is here made to FIG. 6 to explain an interrupt processing in astate in which interruption is generated at the interruption terminalINT₁ upon turning ON→OFF or OFF→ON of the trimming switch TRS or ON→OFFor OFF→ON of the flash emission forcing switch FLS.

First, judgment is made as to whether the trimming switch TRS is ON ornot (step S51), and if the answer is affirmative, the trimming displayTRD is turned ON (step S52). Then, "1" is set to the flash flag FLF topermit interruption, thereafter the booster for charging the maincapacitor in the flash light emitting section FL as well as the chargedetector are turned ON, and upon completion of the charging, thedetector and the booster are turned OFF to terminate the processing(steps S53-S59).

If it is judged in step S5l that the trimming switch TRS is not ON, thetrimming display TRD is turned OFF (step S60) and judgment is made as towhether the flash emission forcing switch FLS is ON or not (step S61).If the answer is affirmative, program passes to step S53 and shifts tothe previously-explained charging routine for the flash light emittingsection FL. On the other hand, if the FLS is not ON, the flash flag FLFis set to "0", the detector and the booster are turned OFF, interruptionis permitted, and thereafter processing is terminated (steps S62-S65).

SECOND EMBODIMENT

The second embodiment is an example of a camera having three kinds ofphotographing modes which are a real focal length photographing mode(normal mode), a flash emitting mode and a pseudo focal lengthphotographing mode (trimming mode).

FIG. 7 is a perspective view showing an external appearance of thesecond embodiment, in which the numerals 201, 202 and 203 denote acamera body, a photographing lens and a flash light emitting device,respectively. Further, numeral 204 denotes a photographing modechange-over button, which, as shown in the same figure, is soconstructed as to slidable among three positions of A, F and Tr toeffect the change-over of mode from one to another. Numeral 205 denotesa light detecting portion in an automatic exposure control device,numeral 206 denotes a finder window; numeral 207 denotes a finderilluminating window; numerals 208 and 209 denote range finder windows inan automatic focusing device; numeral 210 denotes a film counter; andnumeral 211 denotes a shutter release button.

FIGS. 8, 9 and 10 are front views of a camera showing changes inposition of a flash light emitting device caused by change-over ofphotographing modes from one to another, FIG. 8 showing the camera in areal focal length photographing mode, FIG. 9 in a flash emitting modeand FIG. 10 in a pseudo focal length photographing mode.

Explanation will now be made about a mechanism for moving a flash lightemitting device at every change-over of photographing mode.

Adjacent to the photographing mode change-over button 204 is a liftlever 213 which is urged upward by means of a spring (not shown), withthe flash light emitting device 203 being mounted on top of the lever.The lift lever 213 has two retaining portions 213b and 213c. Thephotographing mode change-over button 204 is urged to the real focallength photographing mode position A by means of a spring (not shown).

In the real focal length photographing mode, as shown in FIG. 8, thefirst retaining portion 203b of the lift lever 213 and the photographingmode change-over button 204 are in engagement with each other, and theflash light emitting device 203 is in its lowes position.

Next, when the photographing mode change-over button 204 is changed overto a flash emitting mode position F, the retaining portion 213c of thelift lever 213 comes into engagement with the photographing modechange-over button 204 and the flash light emitting device assumes ahalf-raised position, as shown in FIG. 9.

Further, when the photographing mode changeover button 204 is changedover to a pseudo focal length photographing mode Tr, the lift lever 213is disengaged from the photographing mode change-over button 204 andrises to its highest position, so that the flash light emitting device203 assumes a fully raised position, as shown in FIG. 10. As a result,the distance l between the center of an optical axis of thephotographing lens and the light emitting tube 203a of the flash lightemitting device becomes maximum.

Like the first embodiment, as the flash light emitting device is pusheddown, the lift lever goes down to the position of the flash emittingmode and that of the real focal length photographing mode successivelyreversely to the above

A slide brush is attached to the photographing mode change-over button204 to change over electrical circuits from one to another as will beexplained below in connection with a camera system circuit.

A camera system will now be explained. FIG. 11 is a circuit diagram ofthe camera system. Electric power supplied from a power battery BA isfed to a microprocessor MPU and so on, and from a power transistor BTwhich is operated by a signal provided from an output port P_(wc) of themicroprocessor MPU there is fed electric power to an automatic exposurecontrol device AE, an automatic focusing device AF, a flashmatic timerFMT, a D-A converter DA and a trimming mark printing portion TRM.

Explanation will now be made about switches which are turned ON by theoperation of operating switches of the camera. SW₁ denotes a lightmeasuring switch, which is closed by depressing the shutter releasebutton 211 up to a first stage. SW₂ denotes a release switch, which isclosed by depressing the shutter release button 211 up to a secondstage. These switches SW₁ and SW₂ are connected to interruptionterminals INT₀ and P₀, respectively, of the MPU.

A slide switch interlocked with the photographing mode change-overbutton 204 comprises a slider A and contact pieces B, C, D, E. Thecontact piece B is connected to a ground side of the power source. Thecontact piece C is connected to a pulse generator PG₂ and further to aninput port P₁ of the MPU. The contact piece E is connected to a pulsegenerator PG₃ and further to an input port P₂ of the MPU. The contactpiece D is connected to the pulse generators PG₂ and PG₃ and it controlsthe output of pulse signal.

The pulse generators PG₂ and PG₃ are each so constructed as to provide"H" pulse when the level of input signal changes from "H" to "L" andalso when it changes from "L" to "H". This pulse is not provided whenthe contact piece D is at "L".

When the real focal length photographing mode is selected, the slider Ais on the line NM in FIG. 11 and the outputs of the contact pieces C, Dand E are all in the state of "H". In this state, therefore, signal isnot provided form the pulse generators PG₂ and PG₃.

At the time of change-over from the real focal length photographing modeto the flash emitting mode, the slider A is forced to slide downwardtoward the line FM in FIG. 11. Upon contact of the slider A with thecontact piece C, the output of the contact piece C is inverted to "L"and "H" pulse is provided from the pulse generator PG₂. Further, at thetime of change-over from the flash emitting mode to the pseudo focallength photographing mode, the slider A is forced down toward the lineTM in FIG. 11. In this case, also when the slider A leaves the contactpiece C, "H" pulse is generated from the pulse generator PG₂, so this isinhibited by the contact piece D. Upon contact of the slider A with thecontact piece E, the output of the contact piece E is inverted to "L"and "H" pulse is provided from the pulse generator PG₃.

The reason why the pulse generators PG₂ and PG₃ are so constructed as toprovide "H" pulse not only when the level of input signal changes from"H" to "L" but also when it changes from "L" to "H", is that there isthe case where the change-over of mode is done so that the slider A ismoved upward in FIG. 11 in addition to the case where it is moveddownward in the same figure from the real focal length photographingmode to the flash emitting mode and further to the pseudo focal lengthphotographing mode as previously described.

EXS is not an externally operated switch, but it is an exposurecompletion switch which is turned ON upon completion of exposure controloperation and OFF upon completion of charging of the automatic exposurecontrol device.

UNW denotes a low brightness warning display which is lit by a lowbrightness warning signal developed at an output port P₁₇ of the MPUwhen an object is dark and the calculated shutter speed decreases belowa lower limit speed in the real focal length photographing mode, namely,in the case of a natural light photographing.

Other points on circuit configuration and constructional elements aswell as operations thereof are the same as in the first embodiment sowill not be explained here.

The following description is now provided about signal processings inphotographing-related portions performed within the MPU.

FIG. 12 shows an interrupt processing caused by closing of the lightmeasuring switch SW₁ upon depression of the shutter release button 211.Upon generation of an interrupt the boosting operation for charging themain capacitor of flash light emitting section FL and the operation fordetecting a charged state are stopped (step S201). This is because ifthe exposure control mechanism is operated by an interrupt processingduring boosting, there is fear that the exposure control would not beeffected correctly because the supply voltage is in a dropped state.

Next, the power transistor BT is turned ON (step S202) to supplyelectric power to the automatic exposure control device AE, theautomatic focusing device AF and so on. After waiting for apredetermined time due to the operation of AE and AF, a measuredexposure value is memorized and the AE lock is effecte (steps S203 andS204).

Then, judgment is made as to whether the photographing mode is the realfocal length photographing mode or not (step S205). If the answer isaffirmative program passes to step S220, in which judgment is made as towhether a measured exposure value E_(v) is smaller than a lower speedlimit exposure value E_(vc) which is determined in accordance with thecombination of shutter speed and aperture value. If the answer isaffirmative, namely, when the field is dark, the low brightness warningdisplay UNW is lit. In this case, there is made only a warning displayand an automatic flash light emission is not performed, and programshifts to checking of the state of the release switch SW₂ (steps S220and S221).

When the photographing mode is not the real focal length photographingmode, the charge detector is turned ON to check whether charging iscompleted or not (steps S206 and S207). If the answer is negative,program passes to step S222 to bring about a shutter release lock stateand light a release lock warning indicator RLW. Then, upon turning OFFof the light measuring switch SW₁, program shifts to a stop routine(step S223).

When the charging is completed in step S207, program passes to step S208to turn OFF the detector, then a charge completion display element CHDis lit (step S209).

Then, judgment is made as to whether the release switch SW₂ is ON or not(step S210), and if the answer is negative, judgment is made as towhether the light measuring switch SW₁ is ON or not. If the answer isaffirmative, program again shifts to checking the release switch SW₂. Onthe other hand, when the light measuring switch SW₁ is not ON, programpasses to the stop routine (step S224).

When the release switch SW₂ is ON in the judgment of step S210, arelease signal REL is provided to start the exposure controllingoperation (step S211). Then, judgment is made as to whether thephotographing mode is the pseudo focal length photographing mode or not,and if the answer is affirmative, "L" pulse is provided to P₁₂ to printa trimming mark on the film, while this processing is omitted if theanswer is negative (steps S212 and S213).

Then, judgment is made again as to whether the photographing mode is thereal focal length photographing mode or not, and if the answer isnegative, namely, when the photographing mode is the flash emitting modeor the pseudo focal length photographing mode, a flashmatic timeroperation command signal FLE to be provided to the flashmatic timer FMTis made "L" to actuate the FMT, thereby permitting the emission of flashlight. When the photographing mode is the real focal lengthphotographing mode, the operation command signal FLE is made "H" so asnot to actuate the FMT (steps S214-S216).

Upon completion of the exposure operation at step S217, the winding ofone frame of the film is started and performed until completion of thewinding, whereupon the winding is stopped, and turning OFF of the lightmeasuring switch SW₁, program passes to the stop routine (stepsS217-S221).

FIG. 13 shows the stop routine. First, the flash charging displayelement CHD, release lock warning display RLW and shutter low speedwarning display UNW are turned OFF, and the charge detector, AE lock andpower transistor BT are turned OFF, giving rise to a state which permitsinterruption (steps S231-S237).

Then, judgment is made as to whether the photographing mode is the realfocal length photographing mode or not (step S238). If the answer isnegative, that is, when the flash light emitting device is used, chargeof the main capacitor in the flash light emitting device is performedfor the next photographing and the state of charging is checked. Uponcompletion of the charging, the detector and the booster are turned OFFto terminate the processing (steps S239-S243). When the photographingmode is the real focal length photographing mode, program shifts to stepS243 immediately to turn OFF the booster and terminate the processing.

Reference is here made to FIG. 14 to explain an interrupt processingperformed when a photographing mode changing interruption signal is fedto an interruption terminal INT₁ of the microprocessor MPU.

First, judgment is made as to whether the photographing mode is theflash emitting mode (FM) or not (step S251). If the answer isaffirmative, a pseudo focal length photographing mode display TRD iserased and the flash emitting mode is set (steps S252 and S253). Then,after permission of interruption, the booster and the charge detectorare turned ON to charge the main capacitor in the flash light emittingdevice (steps S254 and S255). When a detected charged state shows thatthe charging is completed, the booster and the detector are turned OFFto terminate the processing (steps S256-S259).

When the photographing mode is not the flash emitting mode, judgment ismade as to whether the photographing mode is the pseudo focal lengthphotographing mode or not. If the answer is affirmative, the trimmingmode display TRD is lit and the pseudo focal length photographing modeis set (steps S260-S262). Thereafter, program shifts to step S254 topermit interruption and then a series of processings for charging theflash light emitting device are performed like the flash emitting mode.

When the photographing mode is neither the flash emitting mode nor thepseudo focal length photographing mode, this means that it is the realfocal length photographing mode, so this mode is set, then the boosterfor charging the main capacitor in the flash light emitting device andthe detector for detecting the completion of charging, and after thepermission of interruption, processing is terminated (steps S263-S266).

THIRD EMBODIMENT

In a camera according to the third embodiment, when the film used is anegative film, it is possible to select three kinds of photographingmodes which are a real focal length photographing mode (normal mode), aflash emitting mode and a pseudo focal length photographing mode(trimming mode), while when the film used is a positive film, it ispossible to select two kinds of photographing modes which are a realfocal length photographing mode (normal mode) and a flash emitting mode.The reason why photographing modes are limited to the above two in thecase of a positive film is as follows.

In the case where photographing is made in the pseudo focal lengthphotographing mode (trimming mode), it is inevitably premised to use anegative film because it is the object to obtain a trimmed and printedphotograph. On the other hand, in the use of a positive film, it israrely the case that a print is prepared simultaneously withdevelopment, and thus the photographing in the pseudo focal lengthphotographing mode (trimming mode) is meaningless. In this case,therefore, only two kinds of photographing modes, one being real focallength photographing mode (normal mode) and the other a flash emittingmode, can be selected.

FIG. 15 is a perspective view showing an external appearance of thethird embodiment, in which the numeral 301 denotes a camera body;numeral 302 denotes a photographing lens; numeral 303 a flash lightemitting device; numeral 305 a light detecting portion of an automaticexposure control device AE; numeral 306 a finder window; numeral 307 afinder illuminating window; numerals 308 and 309 each denote a rangefinder window; numeral 311 denotes a shutter release button; numeral 315denotes a photographing mode selection button; and numeral 316 denotes aliquid crystal display panel for the display of variousphotographing-related data a will be explained later.

FIGS. 16 and 17 are front views of a liquid crystal display panel 316,FIG. 16 showing the case where a negative film is loaded in the camera,and FIG. 17 showing the case where a positive film is loaded in thecamera. As is apparent from FIG. 17, when a positive film is loaded inthe camera, selection is made between the real focal lengthphotographing mode and the flash emitting mode, in the absence of thepseudo focal length photographing mode.

Explanation will now be made about display portions. Numeral 316 denotesa liquid crystal display panel, and numerals 320, 321 and 322 denotedisplay portions showing the real focal length photographing mode, flashemitting mode and pseudo focal length photographing mode, respectively.Selections of those are indicated by changing of tone of uppertriangular display units 320a, 321a and 322a. Further, numeral 323denotes a display portion which indicates the loading of film; numeral324 denotes a film sensitivity display portion; numerals 325 and 326denote display portions which indicate film rewinding and completion ofrewinding (blinking); and numeral 327 denotes a display portion whichindicates the number of frames photographed.

At every depression of the photographing mode selection button 315, arepeated change-over is made like real focal length photographing mode(normal mode)→flash emitting mode→pseudo focal length photographing mode(trimming mode)→real focal length photographing mode (normal mode) inthe case of a negative film loaded in the camera, while a repeatedchange-over is made like real focal length photographing mode (normalmode)→flash emitting modes→real focal length photographing mode (normalmode) in the case of a positive film.

A camera system will now be explained. FIG. 18 is a circuit diagram ofthe camera system. Electric power supplied from a power battery BA isfed to a microprocessor MPU and so on. Further, from a power transistorBT which is operated by a signal provided from an output port P_(wc) ofthe microprocessor MPU, electric power is supplied to an automaticexposure control device AE, an automatic focusing device AF, aflashmatic timer FMT and so on.

SW₁ denotes a light measuring switch, which is closed by depressing theshutter release button 311 up to a first stage. SW₂ denotes a releaseswitch, which is closed by depressing the shutter release button 311 upto a second stage. EXS is not a switch operated externally, but anexposure completion switch which turns ON upon completion of exposurecontrol and OFF upon completion of charging of the automatic exposurecontrol device AE. IFS denotes a one-frame winding switch which turns ONwhen one frame of the film is wound completely and OFF during winding.RWS denotes an overload detecting switch which turns ON upon applicationof an overload during winding of a film, for example, when thephotographing of all frames of the film is over and the film is at itsterminal end and which turns OFF upon rewinding of the film. Outputsides of these switches are connected to an interruption terminal INT₀and input ports P₀, P₃, P₂₀, P₂₁, respectively, of the MPU.

BCS denotes a back lid switch which turns ON upon opening of the backlid of the camera and OFF upon closing thereof. Its output terminal isconnected to an input port P₂₂ of the MPU. For resetting data stored inthe MPU in relation to opening and closing of the back lid, at everyopening ar closing of the same lid, pulse is provided from the pulsegenerator PG₄ and fed to an interruption terminal INT₁ of the MPUthrough an AND gate to effect an interrupt processing. KS denotes a keyswitch which turns ON upon depression of the photographing modeselection button 315. An output side thereof is connected an input portP₁₈ of the MPU, and pulse is provided from a one-shot pulse generator OSand fed through an AND gate to the interruption terminal INT₁ of theMPU, and thus an interrupt processing is performed for informationprocessing relating to photographing mode in the MPU at everychange-over of photographing mode.

FW denotes a film winding control section, which drives a film windingmotor MO in accordance with a winding command signal WSTA provided froman output port P₄ of the MPU. Further, upon turning ON of the overloaddetecting switch RWS, the film is rewound in accordance with a rewindingcommand signal RWSTA provided from an output port P₅₀ of the MPU.

FL denotes a flash light emitting section, whose charging is started inaccordance with a charging start command signal CHSTA provided from anoutput port P₆ of the MPU. For checking a charged state, a detectoractuation signal DET is provided from an output port P₇ of the MPU. Uponcompletion of the charging, a charge completion signal CHC is providedto an input port P₈ of the MPU, which in turn provides a chargecompletion signal from an output port P₉ thereof to light a chargecompletion display element CHD. In the flash emitting mode, in order toprevent from the shutter release operation before completion of chargingof the flash light emitting device, the shutter release operation islocked before the completion of charging in the MP and at the same timea release lock warning signal is provided from an output port P₁₀ of theMPU to light a release lock warning display RLW.

CAD denotes a reading portion for CAS code provided on the outside of afilm patrone and indicative of film sensitivity and allowable errorranges of exposure. Two upper switches ERD constitute a reading portionfor a code indicative of an allowable error range of exposure. Apositive film is given an allowable error range of ±1/2 Ev, so if a readsignal is ±1/2 Ev, it can be judged that a positive film has been loadedand that in other cases a negative film has been loaded.

Five lower switches ISD constitute a reading portion for a codeindicative of a film sensitivity. Whenever a CAS code has been read, anyone of the five switches ISD will be sure to turn ON. In this way it ispossible to judge whether a CAS code is present or not.

Output signals from the above two switches ERD and the five switches ISDare fed to input ports P₂₃ of the MPU. Further, a film sensitivitysignal read by a switch ISD is fed through the flashmatic timer FMT anda digital-analog converter DA to the automatic exposure control deviceAE and a trimming mark printing section TRM, where it is used fordetermining an amount of exposure according to the film sensitivity.

LCD denotes a liquid crystal display, to which are applied signals forsuch various indications as previously explained in connection withFIGS. 15 and 16, from output ports P₂₄ of the MPU.

FDS denotes a film detecting switch which turns OFF upon loading of afilm and ON in the absence of a film. Turning ON thereof duringrewinding of a film causes the rewinding operation to stop. Its outputis fed to an input port P₁₉ of the MPU.

Other circuit constructional portions are common to the first and secondembodiments, so will not be explained here.

The following description is now provided about signal processingsperformed within the microprocessor MPU.

FIG. 19 shows an interrupt processing caused by closing of the lightmeasuring switch SW₁ upon depression of the shutter release button 311.Upon arrival of an interruption signal at the terminal INT₀, theboosting operation for charging the main capacitor of the flash lightemitting section FL and the operation for detecting a charged state arestopped (step S301). This is because if the exposure control device AEis operated by an interrupt processing during boosting, there is fearthat the exposure control would not be effected correctly because thesupply voltage is in a dropped state.

Next, the power transistor BT is turned ON to supply electric power tothe automatic exposure control device AE and the automatic focusingdevice AF (step S302). After waiting for a predetermined time due to theoperation of AE and AF, a measured exposure value Ev is memorized andthe AE lock is effected (steps S303 and S304).

Judgment is made (step S305) as to whether the photographing mode is thereal focal length photographing mode or not. If the answer isaffirmative, judgment is made as to whether the shutter speed is belowits lower speed limit or not, and if the answer is affirmative, the lowbrightness warning display UNW is turned ON and a check is made on therelease switch SW₂ (steps S306, S307 and S308), while if the answer isnegative, an immediate check is made on the release switch SW₂.

When the photographing mode is not the real focal length photographingmode, program passes to step S328 to turn ON the charge detector in theflash light emitting section FL to check the state of charging (stepS329). If the charging is completed, the charge detector is turned OFFand the charge completion display element CHD is turned ON (steps S330and S331), then the program shifts to step S308 to check the releaseswitch SW₂. If the charging has not been completed yet, a shutterrelease lock condition is created to prevent release operation of theshutter, then the release lock warning display RLW is turned ON and thelight measuring switch SW₁ turned OFF, whereupon program passes to astop routine (steps S332 and S333).

Turning again to step S308, a check is made on the release switch SW₂,and if it is not ON, judgment is made as to whether the light measuringswitch SW₁ is OFF or not. If the answer is affirmative, program passesto the stop routine, while if the answer is negative, a check is madeagain on SW₂ (steps S309 and S308).

If the release switch SW₂ is ON as a result of the judgment in stepS308, a release signal is provided to start the exposure controllingoperation (step S310).

Judgment is made (step S311) as to whether the photographing mode is thepseudo focal length photographing mode or not, and if the answer isaffirmative, a trimming mark printing "L" pulse is provided to P₁₂,while if the answer is negative, this processing is omitted (steps S311and S312).

Then, the photographing mode is again checked and if it is the realfocal length photographing mode, a flashmatic timer actuation commandsignal FLE is made "H" to render the timer inoperative, while if thephotographing mode is not the real focal length photographing mode, theflashmatic timer actuation command signal FLE is made "L" to actuate theflashmatic timer FMT, thereby permitting the emission of flash light(steps S313-S315).

Upon completion of the exposure operation, the power transistor BT isturned OFF to turn OFF the charge completion display element CHD and thelow brightness warning display UNW, and one-frame winding of the film isstarted (steps S316-S319). Then, a check is made as to whether thewinding of the film has been completed or not. If the answer isnegative, the overload detecting switch is checked, and in the case ofan overload condition, that is, when the film is at its terminal end,making it impossible to effect winding, program shifts to a rewindroutine (steps S334 and S320).

The winding is stopped upon completion thereof (step S321). Then, acheck is made on whether there remains a film portion or not, and if theanswer is affirmative, "1" is added to a film counter FCR. A value onthe film counter is compared with a predetermined value K (e.g. K=39),and if it is larger than the latter, the value of K is set in the filmcounter FCR and the contents of the film counter is indicated on thedisplay portion. On the other hand, when there remains no film portion,that is, when the film has been wound completely, "0" is set and if thecontents of the film counter is not larger than K, the contents of thefilm counter is indicated on the display portion (steps S322-S326).

Then, upon turning OFF of the light measuring switch SW₁, program passesto the stop routine (step S327).

FIG. 20 shows processings of the rewind routine. First, the windingoperation is stopped, and upon turning OFF of the light measuring switchSW₁, a rewind display is made on the display portion (step S351-S353).Then, rewinding is started and a check is made on whether the filmdetecting switch FDS is ON or not, and if the answer is affirmative,that is, if there remains no film portion, the rewinding operation isstopped and the completion of rewinding is indicated on the displayportion, then the program passes to the stop routine (steps S354-S357).

FIG. 21 shows processings of the stop routine. First, the chargecompletion display element CHD, the release lock warning display RLW andthe low brightness warning display UNW are turned OFF, and furtherturned OFF are the AE lock and the power supply (steps S361-S365). Afterthe permission of an interrupt processing (step S366), a check is madeon whether the photographing mode is the real focal length photographingmode or not (step S367), and if the answer is negative, then for usingthe flash light emitting device, the charging booster and the chargedstate detector are turned ON to start charging. Upon completion of thecharging, the detector and the booster are turned OFF (steps S367-S372).If photographing mode is real focal length photographing mode, thecharging booster is turned OFF immediately and processing is terminated(steps S367, S372).

FIG. 22 shows an interruption routine based on opening and closing ofthe back lid and the change-over selection of photographing mode.

When the back lid switch BCS turns OFF→ON or ON→OFF in response toopening or closing of the back lid of the camera, or when the key switchKS turns ON in response to change-over of photographing mode, aninterruption signal is applied to the terminal INT₁ to start aninterrupt processing.

First, the booster for charging the main capacitor in the flash lightemitting section FL and the charged state detector are turned OFF (stepS381) and a check is made on a back lid open/close flag BCF. This flagis adapted to become "1" upon opening of the back lid and "0" uponclosing of the same lid. Therefore, when the back lid switch BCS is OFF(back lid is closed) and flag BCF=1, there is shown an interruption inthe change of Open→Close of the back lid, while when the back lid switchBCS is ON (back lid is opened) and flag BCF =0, there is shown aninterruption in the change of Close→Open of the back lid.

Further, when the back lid switch BCS is ON and the flag BCF=1, and whenthe same switch is OFF and the flag BCF=0, there are shown interruptionsbased on change-over of photographing mode.

Turning back to the flowchart of FIG. 22, if the flag BCF=1, a check ismade on the back lid switch BCS (step S383), and if this switch is ON,program shifts to a key routine. If the flag BCF≠1, a check is made onthe back lid switch BCS (step S411), and if this switch is ON, programshifts to a back lid open routine, while if it is not ON, program passesto the key routine.

When the back lid switch BCS is not ON as a result of the judgment ofstep S383, this indicates that the back lid has shifted from open toclosed state. In this case, the flag BCF is reset to "0" and a check ismade as to whether a film is loaded in the camera or not (steps S384 andS385). If the answer is affirmative, three frames are wound as apreliminary winding until the photographable first frame arrives at thephotographing position. A "0" is set in the preliminary winding counterPWN and winding is started. Upon completion of the winding, "1" is addedto the counter PWN. This is repeated until PWN=3, whereupon the windingis stopped and "1" is set in the film counter FCR, then the countercontents are indicated on the display portion (steps S386-S393).

After waiting for a predetermined time for stabilization of the film,there is made reading of CAS code on the film patrone (steps S394 andS395). A check is made on whether CAS code CAD is present or not, and ifthe answer is affirmative, film sensitivity by ISO standard is displayedwith "DX" indication on the display portion (steps S396 and S397). Then,whether the film is a negative film or not is judged from the codeindicative of an allowable error range of exposure, and if the answer isaffirmative, "1" is set to a negative film flag NFF, while if the answeris negative, the NFF is reset to "0" (steps S398-S400). Thereafter,program shifts to step S404 to check the negative film flag NFF.

When there is no film loaded or no CAS code as a result of the judgmentin step S396, program passes to display reset routine, in which the "DX"indication on the display portion is turned OFF, which ISO 100 isindicated as a film sensitivity. In this case, moreover, "1" is set tothe negative film flag NFF to permit the selection of the pseudo focallength photographing mode (steps S401-S403).

Next, a check is made as to whether the negative film flag NFF is "1" ornot, and if the answer is affirmative, the pseudo focal lengthphotographing mode (trimming mode) mark 322 is displayed out of threekinds of photographing mode indication marks (the reference numerals320, 321 and 322 in FIG. 16). On the other hand, if the negative filmflag NFF is not 1", the display of the pseudo focal length photographingmode (trimming mode) mark 322 is erased (steps S405 and S406). Then, thereal focal length photographing mode (normal mode) mark 320 and theflash emitting mode mark 321 are displayed (step S407).

Next, the real focal length photographing mode (normal mode) as a basicmode is set and an index (320a in FIG. 16) on the real focal lengthphotographing mode (normal mode) mark 320 out of the photographing modeindication marks is turned ON, and processing is terminated afterpermission of an interrupt processing (steps S408-S410).

FIG. 23 illustrates the photographing mode changing key routine shown inFIG. 22. In the key routine, first, a check is made as to whatpreviously set photographing mode has so far been set (step S421). If itis the real focal length photographing mode (normal mode), the flashemitting mode is set and a flash emitting mode index 321a as aphotographing mode indication index is turned ON, while the previousreal focal length photographing mode (normal mode) index 320a is turnedOFF (steps S422-S424).

When the photographing mode is not the real focal length photographingmode, program passes to step S425 to check whether the photographingmode is the flash emitting mode or not, and if the answer isaffirmative, a check is made as to whether the negative film flag NFF is"1" or not (step S426). If NFF=1, namely, if the loaded film is anegative film, or film is not loaded in the camera, or if the film isnot provided with CAS code, the pseudo focal length photographing modeis set because this mode can be set only at this time, and the pseudofocal length photographing mode (trimming mode) index 322a is turned ON,while the previous flash emitting mode index 321a is turned OFF (stepsS427-S429). When the negative film flag NFF is not "1", namely, if thefilm is a positive film, program shifts to step S430 to set the realfocal length photograping mode because it is impossible to make settingof the pseudo focal length photographing mode.

When the photographing mode is not the flash emitting mode, either, thismeans that the photographing mode has so far been the pseudo focallength photographing mode, so the program shifts to step S430 to set thereal focal length photographing mode (step S430), and the real focallength photographing mode (normal mode) index 320a is turned ON, whilethe flash emitting mode index 321a and the pseudo focal lengthphotographing mode (trimming mode) index 322a are turned OFF (stepsS431-S433).

Upon completion of the above processing, program returns to the stoproutine.

FIG. 24 illustrates the back lid opening routine shown in FIG. 22. Thisroutine is started when the back lid of the camera is opened and theback lid switch BCS is ON. A "1" is set to the back lid open/close flagBCF and the rewind displays 325 and 326 of the display portion is turnedOFF (steps S441-S442). Then, a check is made as to whether the windingof the film has been completed or not. If the answer is negative, thefilm winding is started, and upon completion of the winding, thisoperation is stopped. Next, the film counter FCR is returned to "0" andthe counter contents "0" is indicated on the film counter 327 in thedisplay portion. When the film winding has been completed, the filmwinding processing is omitted, the film counter FCR is returned to "0",the counter contents is indicated on the display portion, and programshifts to the display reset routine shown in FIG. 22 (steps S443-S448).

In the above embodiments, two or three photographing modes are prepared,but it is possible to provide four photographing modes such as realfocal length photographing mode, pseudo focal length photographing mode,real focal length photographing mode with flash emitting and pseudofocal length photographing mode with flash emitting, and when selectingpseudo focal length photographing mode with flash emitting, expand thedistance between the optical axis of the objective lens and flashemitting device compared with the said distance in real focal lengthphotographing mode with flash emitting.

Further, it is possible to make judge the negative film or positive filmby checking the switch which is selected by users manually and indicatesthe kind of loaded film, instead of the automatic setting of the kind offilm by reading of DX code on the film cartridge.

Furthermore, it is possible to construct camera in which the selectionof photographing mode is performed by manual operation of a modeselecting lever and the kind of loaded film is set by manual operationof another film selecting lever, and in which both levers areinterlocked with each other so that the mode selecting lever can not beshifted to a position selecting the pseudo focal length photographingmode if the film selecting lever is set to a position corresponding to apositive film, whereby the pseudo focal length photographing mode cannot be selected when the positive film is set.

Additionally, it is possible to inhibit the shutter release operationand to indicate the warning of shutter release lock condition when thepseudo focal length photographing condition is selected in the casewhere the positive film is loaded. In this case, it is possible todetect such state in response to the closure of light measuring switchSW₁ and to immediately changeover the photographing mode to the realfocal length photographing mode or the flash light emitting mode priorto the closure of the release switch SW₂.

What is claimed is:
 1. A photographic camera comprising:means forselecting a real focal length photographing mode in which a normal rangein a frame of a film will be printed on a photographic paper and apseudo focal length photographing mode in which a range narrower thanthe normal range in a frame of the film will be printed on aphotographic paper; means for measuring an amount of light coming froman object to be photographed to produce a light measuring signalindicative of the measured amount of light; means responsive to saidlight measuring signal for discriminating whether the measured amount oflight is under a predetermined amount to produce a discriminating signalindicative of the discriminated result; means responsive to saiddiscriminating signal for producing a flash emission signal during anexposure control operation, only when the measured amount isdiscriminated to be under the predetermined amount, in the condition thereal focal length photographing mode is selected, and for producing aflash emission signal during an exposure control operation independentlyof the discriminating signal, in the condition the pseudo focal lengthphotographing mode is selected; and means for emitting a flash of lightin response to the flash emission signal.
 2. A photographic camera asclaimed in claim 1, further comprising means for recording on saidphotographic film an information signal which indicates that the pseudofocal length photographing mode is selected when the pseudo focal lengthphotographing mode is selected by said mode selecting means.
 3. Aphotographic camera as claimed in claim 2, wherein the mode selectingmeans further includes means for selecting a flash emitting mode inwhich the flash emitting means forcibly emits the flash of lightindependently of the discriminating signal, and wherein the flashemission signal producing means produces the flash emission signalduring an exposure control operation independently of the discriminatingsignal in the condition the flash emitting mode is selected, and whereinthe photographic camera further comprises means for stopping theoperation of the information recording means when the flash emittingmode is selected.
 4. A photographic camera as claimed in claim 1,further comprising means for controlling a distance from an optical axisof an objective lens to a light emitting portion of the flash emittingmeans so that the distance when the pseudo focal length photographingmode is selected, is extended in comparison with the distance when thereal focal length photographing mode is selected.